Everything That Is Capable Of Being Perceived Must Have Two Elements In It: 1) It Must Exist,

 - 2) It must shine. If the obstruction is complete, it will result in the cognition of its non-existence; if it is partial, it will not be perceived properly

- If a lamp exists and is lighted but is covered by an opaque dome its existence cannot be cognised nor its light. If the dome is translucent, like ground glass

- the light cannot be denied but the lamp will not be seen; to an indifferent seer who does not remember that the dome by itself is not capable of illuminating

- but sees the light, the dome itself will seem to be incandescent. That is, he will attribute to the dome the lighting capacity which really belongs to the unseen lamp within,

- If he does so, it will be unnecessary for him to grant the existence of  a lamp to explain the light. If the dome is removed, both the existence and the luminosity 

- of the lamp will be clearly perceived beyond all doubt. It is the dome therefore that stands in the way of right perception. That is the "obstruction" to the 

- perception of truth. Similarly, the joint recital of the Vedas by several boys at the same time is the "obstruction" that prevents the distinct perception of the son's voice

- On the same analogy, if the Self does exist and does shine and is yet not perceived, there must be an obstruction which prevents such perception. What is it?